Check that the brake switch [actvated by brake petal] is grounding when actvated, there is no current to a brake light switch, it is used to ground the brake bulb, use an ohlm meter to check for continuity when switch is actvated by brake petal.
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First check fuses. The parking lights and dash lights come on with the light switch, but have different fuses. if you have front lights( the switch is good), but no rear, check the grounds in the rear. They are usually mounted to the frame on the drivers side rear. As for the dash they have their own grounds. Places I know are at the steering column and behind the drivers side kick panel. You could also have problems at the plugs them selves, Corrosion. If you have no parking, brake, or reverse lights, it is a ground problem.
It sounds like you might have a break in the wiring going to the tail lights. Does your parking lights up front work? If they are out too, then the problem is with the park light circuit. Check for a blown fuse that says "Park" in your owner's manual to make sure that your dash lights are indeed on the same fuse. Otherwise it sounds like you have a break or corroded connector going to the tail lights.
On "most" vehicles, the parking, tail, lic plate AND dash lights are all on the same circuit. Usually, the fuse will be labeld "park", "tail", or "illum".
If you have dash lights but no park lights, it's likely that there is a break in the wiring somewhere...
get yourself a tester to see if you are getting power to the light socket, have someone push on the brake petal and use the tester to check for power. If no power, you have a broken wire somewhere between the rear lights and dash [fuse panel] check for corrosion in bulb socket. try to find the wire along the frame to the rear lights for any breaks in the insulation. electrical is one of the hardest problems to solve, good luck.
First off locate the fuse panel and make sure there are no blown fuses and make sure there are no blown bulbs on the exterior lights. If there are no problems there then the problem more than likely lies within the steering column itself. Unless you are mechanically inclined, I suggest you take the vehicle to a shop to have the steering column repaired.